Critical CSS Extractor
Fetch a page and extract CSS rules that match elements in its DOM.
How to Extract Critical CSS?
- Enter the URL of the page you want to optimize.
- Click Extract to fetch the page and analyze CSS.
- View the extracted critical (above-the-fold) CSS rules.
- Inline this CSS in your page's <head> for faster rendering.
- Load the full CSS asynchronously for better performance.
Critical CSS Extractor — Improve Page Speed
Extract the above-the-fold CSS needed to render your page's initial view instantly. Critical CSS is the minimal set of styles required to display content visible without scrolling. Inlining it directly in your HTML <head> eliminates render-blocking stylesheet requests and dramatically improves perceived load time and Core Web Vitals scores.
Why Critical CSS Matters
- Faster First Contentful Paint (FCP) — Users see styled content in milliseconds, not after the full CSS loads
- Better Lighthouse / CrUX Scores — Reduces render-blocking resources, a key PageSpeed metric
- Improved SEO — Google uses Core Web Vitals as a ranking signal
Implementation
Inline the extracted CSS in a <style> tag in your <head>, then load the full stylesheet asynchronously using rel="preload" or a JavaScript loader.
